Antimony triselenide

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| ImageFile = Structure of Sb2Se3.jpg

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| OtherNames = {{ubl|Antimonselite|Antimony(III) selenide|Selenoxyantimony}}

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| StdInChI = 1S/2Sb.3Se/q2*+3;3*-2

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| StdInChIKey = WWUNXXBCFXOXHC-UHFFFAOYSA-N

| InChIKey1 = WWUNXXBCFXOXHC-UHFFFAOYSA-N

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| CASNo = 1315-05-5

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| PubChem = 6391662

| SMILES = [SbH3+3].[SbH3+3].[Se-2].[Se-2].[Se-2]

| InChI = 1S/2Sb.3Se/q2*+3;3*-2

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| Section2 = {{Chembox Properties

| Sb=2|Se=3

| Appearance = black crystals

| Density = 5.81 g/cm³, solid

| MeltingPtC = 611

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| CrystalStruct = Orthorhombic, oP20, SpaceGroup = Pnma, No. 62

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| REL = TWA 0.5 mg/m³ (as Sb){{PGCH|0036}}

| PEL = TWA 0.5 mg/m³ (as Sb)

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| Section8 = {{Chembox Related

| OtherAnions = antimony(III) oxide, antimony(III) sulfide, antimony(III) telluride

| OtherCations = arsenic(III) selenide, bismuth(III) selenide

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Antimony triselenide is the chemical compound with the formula {{chem2|Sb2Se3|auto=1}}. The material exists as the sulfosalt mineral antimonselite (IMA symbol: Atm{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA-CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3 |pages=291–320|doi=10.1180/mgm.2021.43 |bibcode=2021MinM...85..291W |s2cid=235729616 |doi-access=free}}), which crystallizes in an orthorhombic space group.Jambor, J. L.; Grew, E. S."New Mineral Names" American Mineralogist, Volume 79, pages 387-391, 1994. In this compound, antimony has a formal oxidation state +3 and selenium −2. The bonding in this compound has covalent character as evidenced by the black color and semiconducting properties of this and related materials.{{cite book |last1=Madelung |first1=O |title=Semiconductors: data handbook |publisher=Springer |isbn=9783540404880 |edition=3rd|year=2004 }} The low-frequency dielectric constant (ε₀) has been measured to be 133 along the c axis of the crystal at room temperature, which is unusually large.{{Cite journal|last1=Petzelt|first1=J.|last2=Grigas|first2=J.|date=January 1973|title=Far infrared dielectric dispersion in Sb2S3, Bi2S3 and Sb2Se3 single crystals|journal=Ferroelectrics|volume=5|issue=1|pages=59–68|doi=10.1080/00150197308235780|bibcode=1973Fer.....5...59P |issn=0015-0193}} Its band gap is 1.18 eV at room temperature.{{cite journal |last1=Birkett |first1=Max |last2=Linhart |first2=Wojciech M. |last3=Stoner |first3=Jessica |last4=Phillips |first4=Laurie J. |last5=Durose |first5=Ken |last6=Alaria |first6=Jonathan |last7=Major |first7=Jonathan D. |last8=Kudrawiec |first8=Robert |last9=Veal |first9=Tim D. |title=Band gap temperature-dependence of close-space sublimation grown Sb2Se3 by photo-reflectance |journal=APL Materials |year=2018 |volume=6 |issue=8 |pages=084901 |doi=10.1063/1.5027157 |doi-access=free }}

The compound may be formed by the reaction of antimony with selenium and has a melting point of 885 K.